Question

differentiate between altitude and median in a triangle

Answer 1

Altitude is the perpendicular in a triangle. It is always 90°.
Median divides the triangle in two equal parts. It is not always 90°.

Answer 2

$\huge \underline \bold { \pink{A} \red{l} \blue{t} \green{i} \purple{t}{u} \orange{d} \red{e}} :-$

It is a line segment from a vertex perpendicular to the opposite side.

$\huge\underline \bold{ \red{M} \green{e} \pink{d} \blue{i} \purple{a} \orange{n}} : -$

It is a line segment joining a vertex to the midpoint of opposite side, bisecting that side.